Dutch Modelling and Aviation

In Memoriam

Klaas Willem Jonker
(Wilko)
† April 30, 2018

On Monday, April 30, 2018, Wilko Jonker passed away after a long illness at the age of 58. He leaves behind a wife and two children. The Dutch military aviation and plastic model building were his hobby and on this website he has shared all the knowledge he has gathered about it over the many years. His hobby was able to distract him from the raging disease in his body until the last week of his life. The contacts with other hobbyists were a major support for him.

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 History

Carl Bücker has been for about ten years director at Svenska Aero AB (SAAB), Sweden and returned to Berlin in 1932. Together with Anders Anderson, a former SAAB designer he raised the "Bücker Flugzeugbau GmbH".
The first aircraft to be designed and produced was the Bü-131 Jungmann, equipped with a Hirth HM-60R engine, rated at 80 hp.
This aircraft was selected to become the primary trainer of the Luftwaffe

Later the aircraft was also built under license in Switzerland, Spain, Hungary, Czechoslovakia and Japan.
In Japan over 1200 examples were built as Kokusai Ki-86 and also as Kyūshū K9W

In Spain CASA built the type until the sixties of the twentieth century.

Versions.

Bu 131A:
Two seat primary trainer.
Bu 131B:
Improved version with a more powerful Hirth HM 504A-2 engine.
Bu 131C:
Experimental version with a Cirrus Minor engine, rated 90 hp.
Bu 131D:
Succeeded the Bu-131B in 1938, with smaller changes and improvements.
Kokusai Ki-86A:
Japanese license for the Japanese air force.
Kyūshū K9W1:
Japanese license for the Japanese navy.
Tatra T-131:
Czech license version.
Aero C-4:
Czech production version during the war.
Aero C-104:
Czech post war version equipped with a Walter-Minor 4-III engine.
CASA I.131:
Spanish license built version.

 

Technical Information Bücker Bü-131B Jungmann
Dimensions:
Length: 6,62 m Wingspan: 7,4 m
Height: 2,35 m Wing area: 13,5 m2
Weight:
Empty weight: 380 kg Max. start weight: 670 kg
Performances:
Max. Speed: 183 km/hr Rate of climb: 168 m/min
Cruising Speed: 170 km/hr    
Range: 628 km Ceiling: 4050 m
Miscellaneous:
Engine: One Hirth HM 504A-2 rated 100 hp
Crew: Two men
Armament: None

 

Technical Information Bücker Bü-131D Jungmann
Dimensions:
Length: 6,62 m Wingspan: 7,4 m
Height: 2,35 m Wing area: 13,5 m2
Weight:
Empty weightt: 380 kg Max. start weight 670 kg
Performances:
Max. Speed: 183 km/hr Rate of climb: 168 m/min
Cruising Speed: 170 km/hr    
Range: 628 km Ceiling: 4050 m
Miscellaneous:
Engine: One Hirth HM 504A-2 rated 105 hp
Crew: Two men
Armament: None

 

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